linux-kernel - [PATCH v2] gpio: dwapb: fix NULL pointer dereference at dwapb_gpio

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Date:   Fri, 27 Nov 2020 16:50:02 +0800
From:   Luo Jiaxing <luojiaxing@...wei.com>
To:     <bgolaszewski@...libre.com>, <linus.walleij@...aro.org>,
        <Sergey.Semin@...kalelectronics.ru>
CC:     <andy.shevchenko@...il.com>, <andriy.shevchenko@...ux.intel.com>,
        <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...wei.com>
Subject: [PATCH v2] gpio: dwapb: fix NULL pointer dereference at dwapb_gpio_suspend()

Following Calltrace is found when running echo freeze > /sys/power/state.

[  272.755506] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010
[  272.755585] Call trace:
[  272.755587]  dwapb_gpio_suspend+0x18/0x318
[  272.755588]  pm_generic_suspend+0x2c/0x48
[  272.755595]  acpi_subsys_suspend+0x60/0x70
[  272.755599]  dpm_run_callback.isra.18+0x40/0xe0
[  272.755601]  __device_suspend+0xf4/0x360

The reason is platform_set_drvdata() is deleted, and dwapb_gpio_suspend()
get *gpio by dev_get_drvdata().

Fixes: feeaefd378ca ("gpio: dwapb: Use resource managed GPIO-chip add data method")
Signed-off-by: Luo Jiaxing <luojiaxing@...wei.com>
Acked-by: Serge Semin <fancer.lancer@...il.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

---
   v1->v2:
          1. reduce calltrace log
          2. delete blank line in tag block
---
---
 drivers/gpio/gpio-dwapb.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c
index 2a9046c..4275c18 100644
--- a/drivers/gpio/gpio-dwapb.c
+++ b/drivers/gpio/gpio-dwapb.c
@@ -724,6 +724,8 @@ static int dwapb_gpio_probe(struct platform_device *pdev)
 			return err;
 	}
 
+	platform_set_drvdata(pdev, gpio);
+
 	return 0;
 }
 
-- 
2.7.4